According to Shull and Thornton, the naked embryos of both the upper and the lower seeds of Xanthium have

A. A much lower oxygen requirement than does the intact seed, and as temperature increases, the oxygen requirement decreases

B. A very high oxygen requirement than does the intact seed, and the oxygen requirement is independent of the temperature

C. An equal amount of oxygen requirement as that required by the intact seed, and the oxygen requirement decreases with the decrease in temperature

D. No oxygen requirement but needs high temperature

Answer: Option A